Female hybrids do not have venom in there system this is proven
when Nessie repeadily bites Jacob.

in breaking dawn and him healing with no problem. the venom
cain't be less infectious or less potent

this is shown with Nahuel the Venom is either there or not
there. Nahuel's venom as as the same as any full vampy beacse he
has it like they do as for females they don't have the venon in
thems at all. its unknown though weather its random or by gender.
but even still Nessie wouldn't need the venom in her system to be
fine eitther way

I have a question about the volturi in this wiki it says the
volturi were born in a.d 450 but in breaking dawn Vladimir and
Stephan said they've been waiting 1,500years for vengence and even
in the new moon dirictor's book said the volturi have been alive
for 2,000years so shouldn't the volturi been created in the
17,00's ?

In breaking dawn if a fight did break out. which
side do you think woul have won the fight and which side would
have lost ?

The Gaurd rearranged themselves in a arrow-shaped formation
Demetri leading at spear point. Their actions were measured,
deliberate. Our reaction was more disorganized.
Snarls and hisses ripped through the air as we took off straight to
our deaths.